strypey, "[SubStack] began encouraging individual writers to recommend one another, funneling tens of thousands of subscribers to like-minded people. It started to send out an algorithmically ranked digest of potentially interesting posts to anyone with a Substack account, showcasing new voices from across the network. And in April of this year, the company launched Notes, a text-based social network resembling Twitter that surfaces posts in a ranked feed."
#CaseyNewton, 2012
https://platformer.substack.com/p/why-substack-is-at-a-crossroads